Ideas that can make over 1 million a year

Space Liner Fleet (2) from high pop. to high pop. Must be HS 5 or more (frigate-size or up)
Salvage business (requires 2 lv. 6 space stations, an inhabited planet, and a jump tug: total cost is 11 million)
Freight Liner Fleet (3) from resource to industrial. Must be HS 9 and up.
Mercenary company with ships (3 assault scouts, 2 frigates minimum: cost will be over 7 million)
Robot manufacturer (needs factory, costs about 5 million plus parts)